Modal markup has changed significantly. The .modal-header, .modal-body, and .modal-footer sections are now wrapped in .modal-content and .modal-dialog for better mobile styling and behavior. Also, you should no longer apply .hide to .modal in your markup.

As of v3.1.0, the HTML loaded by the remote modal option is now injected into the .modal-content (from v3.0.0 to v3.0.3, into the .modal) instead of into the .modal-body. This allows you to also easily vary the header and footer of the modal, not just the modal body.

JavaScript events are namespaced. For example, to handle the modal “show” event, use 'show.bs.modal'. For tabs “shown” use 'shown.bs.tab', etc.

For more information on upgrading to v3.0, and code snippets from the community, see Bootply.